Brake-shoe.



PATBNTED AUG. 14, 1906.

BRAKE SHOE. APlLIUATIOl FILED APR.6.1904.

fNO. 828,442.

x Ivi- James ferfm/ www wif/16.3.5195,'

UNITED STATES PATENT OFFICE.

`'JAMES SHIELDS THOMPSON, OF CHICAGO, ILLINOIS, ASSIGNOR 'lO- AMERICAN BRAKE SHOE 6% FOUNDRY COMPANY, OF JERSEY CITY, NEW' JERSEY, A CORPORATION OF NEW JERSEY. A

BiaAKE-SHOE. A

' f Specification of Letters Patent.

Patented Aug. 14, 1906.

Application mea Aprile. i904. Serial No. 201,923.

at Chicago, inthe State of Illinois, have invented certain new and useful Im rovements in Brake-Shoes, of which the fo owing is aspecification.

My invention relates to the wearing blocks.

i used in railway brakes and the like, `and parbined forms of metal.

ticularly to brake shoes made of several com- The objects of the invention are, to provide a brake shoe having a wearing surface `of compound material and being [provided with a strengthening back, to provi e -a superior material for the wearing face of the brake shoe, to provide a superior mode of binding together the Wearing surface and the strengthening back and an attaching lug for the shoe, and to generally improve the structure and efiiciency of brake shoes. These objects, together with other advantages which will hereinafter appear, I attainby means of the lconstruction illustrated in preferred forms in the accompanying drawing, wherein- A Figures 1, 2, and 3 are respectively a side elevation, a top plan, and an under plan, of

Y the brake shoe shell and `backbefore the filling or face is placed therein;

Figure 4 is a cross section taken on line (4) of Figure 1 showing the completed shoe with a filling containing expanded steel therein;

Figure 5 is a cross section taken on line (5) of Figure 1 of the shoe, with the filling omitting the expanded steel, and

Figure 6 is a -central cross section of a modified form of the shoe in which is used a malleable metal strap for the attaching lug. In order to provide for a superior uniform wearing material and surface on the face of the shoe of compound material, I provide a cast shell 7 having embedded therein a ductile metal steel back 8 and the face of the Shoe having over nearly its entire surface a space 9 with undercut sides so as to safely retain the ller placed therein. The backing 8 may be made of steel plate and is preferably of curved cross section and vits ends are embedded under the seat 10 -for the brake head and under the lugs 11, and has cut-out portions near the center at 12, and. open spaces 13, through which the cast metal of the shell may run to securely anchor the back. y

rlhe main body and the Wearing face of the shoe is a filling in some cases made of composition of comminuted iron and asphaltum 14,`

and in other cases this also has embedded therein a series of layers of fragmentary steel such as common expanded metal? 15, as shown in Figure 4.

In vFigure 6 I have shown a modification in Which in place of the cast attaching lug 11', I provide a lug made of a malleable steel strap, 11a as shown in Figure 6. It has its lower ends 16 somewhat turned outward so as to secure a rm anchorage in the cast metal of the body 7 and it will be seen that this strap lits in lthe cut-out portions 12 of the steel back 8.

By this construction I provide a secure means of holding the composition filling and at the same time provide a shell which is thoroughly braced and supported by the steel back and in the case of Figure 6 an additional feature is the malleable strap for the attaching lugs. Other advantages will occur from inspection of the drawings.

Having thus described my invention and illustrated its use, what`I claim as new, and desire to secure by Letters Patent, is'the following:

1. A brake shoe having a. supporting back with comminuted iron and expanded sheet metal embedded therein.

2. In a brake shoe the combination lof a cast shell, a composition filling in the face forming the wearing surface of the shoe, a

ductile metal backing embedded inthe metal of the shell, and a ductile metal lug formed of a strap-anchored in the metal of the shell, substantially as described.

3. A brake shoe having a steel strengthening back and a wearing face composed of asphaltum with commmuted iron and expanded steel embedded therein.

4. In a brake shoe a cast shell for the body of the shoe, in combination with a ductile I 5 tachjng u also embedded in thev cast metaly metal backing embeddedy thelze'm, said back# sivned my name in the presence of the two jug being of euxlved (o sctlonhand hafiing su scribed Witnesses.

its edges entire yem e e in te meta orA f anchura e, and a malleable strap for the a1',- JAMES SHIELDS THOMPSON.

Witnesses:

CEAS, H. EBERT, f EDWARD C. BURNS.

' oftheshe v In testimeny whereof 1 have hereunder 

